Membership Plugin: Subscription page not showing buttons to upgrade for non admin members

Somethig odd seems to be happening - I'm sure there's a simple setting I need to change somewhere, but... I have two subscriptions, a free one and a paid for (recurring monthly payment) one. I have signed up a new account under the free subscription ,but when I go an look at the subscription page I can't se the 'unsubscribe' or 'subscribe' buttons. I can see the details of my current subscription, and the other available one though.

However, if I log in to an admin account and take a look at the subscription page I do see the two buttons... Can anyone help?